External 3800mah 2S Gens ace lithium battery mount for EV800D goggle system. Double or triple your battery life! Works like Fatshark Goggles now and one less charger to drag around! The stock battery is 2 cell and has no balance tab, causing short battery life. Add a 3800mah 2S lithium polymer battery and strap it to the goggles using this battery mount. The mount can be ziptied to the goggle strap.